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an airplane using 20 TR bootstrap air refrigeration system has ambient conditions of 0.9 bar and 15C. Ram air pressure after isotropic compression is 1.1 bar.
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Main compressor exit pressure is 3.5 bar, and exit pressure of secondary compressor exit pressure is 4.5 bar. The cabin is required to be maintained at 1 bar and $25^o$C. Isentropic efficiency of each compressor is 85% and that of cooling turbine is 90%. The effectiveness of both heat exchangers is 60%. Find:
i) Mass flow rate of air passing through the cabin
ii) Power required
iii) COP of the system. Assume Cp = 1.01 KJ/KgK.
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